The phrase "squalid conditions" refers to extremely dirty and unhygienic living circumstances that are unpleasant and unfit for human beings. Full definition
They are living in squalid conditions in overflowing, makeshift camps and settlements. (premierchristianity.com)
Dogs at puppy mills typically receive little to no medical care, live in squalid conditions with no exercise, socialization or human interaction, and are confined inside cramped wire cages for life. (humanesociety.org)
Underdeveloped countries are not going to have problems with toxics and drugs escaping into drinking water, but your composting potty idea is not going to work very well where people live in squalid conditions of 500 persons on up per square mile, Unfortunately, many more people live under such crowded conditions than those, who can make a composting potty to dump out in some isolated spot where a few hundred people or less people live on a square mile. (dotearth.blogs.nytimes.com)